[matrix] Implementation

config.json

@@ -589,6 +589,15 @@
         "prerequisites": [],
         "difficulty": 1,
         "topics": []
+      },
+      {
+        "slug": "matrix",
+        "name": "Matrix",
+        "uuid": "50ba9ec3-93a7-4963-868e-0d08f7c01acd",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 1,
+        "topics": []
       }
     ]
   },

exercises/practice/matrix/.docs/instructions.md

@@ -0,0 +1,38 @@
+# Instructions
+
+Given a string representing a matrix of numbers, return the rows and columns of that matrix.
+
+So given a string with embedded newlines like:
+
+```text
+9 8 7
+5 3 2
+6 6 7
+```
+
+representing this matrix:
+
+```text
+    1  2  3
+  |---------
+1 | 9  8  7
+2 | 5  3  2
+3 | 6  6  7
+```
+
+your code should be able to spit out:
+
+- A list of the rows, reading each row left-to-right while moving top-to-bottom across the rows,
+- A list of the columns, reading each column top-to-bottom while moving from left-to-right.
+
+The rows for our example matrix:
+
+- 9, 8, 7
+- 5, 3, 2
+- 6, 6, 7
+
+And its columns:
+
+- 9, 5, 6
+- 8, 3, 6
+- 7, 2, 7

exercises/practice/matrix/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "habere-et-dispertire"
+  ],
+  "files": {
+    "solution": [
+      "Matrix.rakumod"
+    ],
+    "test": [
+      "matrix.rakutest"
+    ],
+    "example": [
+      ".meta/solutions/Matrix.rakumod"
+    ]
+  },
+  "blurb": "Given a string representing a matrix of numbers, return the rows and columns of that matrix.",
+  "source": "Exercise by the JumpstartLab team for students at The Turing School of Software and Design.",
+  "source_url": "https://turing.edu"
+}

exercises/practice/matrix/.meta/solutions/Matrix.rakumod

@@ -0,0 +1,9 @@
+unit module Matrix;
+
+sub extract-row(:$string, :$index) is export {
+  $string.lines[$index.pred].words
+}
+
+sub extract-column(:$string, :$index) is export {
+  gather for $string.lines { take .words[$index.pred] }
+}

exercises/practice/matrix/.meta/solutions/matrix.rakutest

@@ -0,0 +1 @@
+../../matrix.rakutest

exercises/practice/matrix/.meta/template-data.yaml

@@ -0,0 +1,38 @@
+properties:
+  row:
+    test: |-
+      sprintf(q:to/END/, %case<input><string>.raku, %case<input><index>, %case<expected>.List<>.raku, %case<description>.raku);
+      cmp-ok(
+          extract-row( :string(%s), :index(%s) ),
+          "~~",
+          %s,
+          %s,
+      );
+      END
+  column:
+    test: |-
+      sprintf(q:to/END/, %case<input><string>.raku, %case<input><index>, %case<expected>.List<>.raku, %case<description>.raku);
+      cmp-ok(
+          extract-column( :string(%s), :index(%s) ),
+          "~~",
+          %s,
+          %s,
+      );
+      END
+
+unit: module
+example: |-
+  sub extract-row(:$string, :$index) is export {
+    $string.lines[$index.pred].words
+  }
+
+  sub extract-column(:$string, :$index) is export {
+    gather for $string.lines { take .words[$index.pred] }
+  }
+
+stub: |-
+  sub extract-row(:$string, :$index) is export {
+  }
+
+  sub extract-column(:$string, :$index) is export {
+  }

exercises/practice/matrix/.meta/tests.toml

@@ -0,0 +1,34 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[ca733dab-9d85-4065-9ef6-a880a951dafd]
+description = "extract row from one number matrix"
+
+[5c93ec93-80e1-4268-9fc2-63bc7d23385c]
+description = "can extract row"
+
+[2f1aad89-ad0f-4bd2-9919-99a8bff0305a]
+description = "extract row where numbers have different widths"
+
+[68f7f6ba-57e2-4e87-82d0-ad09889b5204]
+description = "can extract row from non-square matrix with no corresponding column"
+
+[e8c74391-c93b-4aed-8bfe-f3c9beb89ebb]
+description = "extract column from one number matrix"
+
+[7136bdbd-b3dc-48c4-a10c-8230976d3727]
+description = "can extract column"
+
+[ad64f8d7-bba6-4182-8adf-0c14de3d0eca]
+description = "can extract column from non-square matrix with no corresponding row"
+
+[9eddfa5c-8474-440e-ae0a-f018c2a0dd89]
+description = "extract column where numbers have different widths"

exercises/practice/matrix/Matrix.rakumod

@@ -0,0 +1,7 @@
+unit module Matrix;
+
+sub extract-row(:$string, :$index) is export {
+}
+
+sub extract-column(:$string, :$index) is export {
+}

exercises/practice/matrix/matrix.rakutest

@@ -0,0 +1,62 @@
+#!/usr/bin/env raku
+use Test;
+use lib $?FILE.IO.dirname;
+use Matrix;
+
+cmp-ok( # begin: ca733dab-9d85-4065-9ef6-a880a951dafd
+    extract-row( :string("1"), :index(1) ),
+    "~~",
+    (1,),
+    "extract row from one number matrix",
+); # end: ca733dab-9d85-4065-9ef6-a880a951dafd
+
+cmp-ok( # begin: 5c93ec93-80e1-4268-9fc2-63bc7d23385c
+    extract-row( :string("1 2\n3 4"), :index(2) ),
+    "~~",
+    (3, 4),
+    "can extract row",
+); # end: 5c93ec93-80e1-4268-9fc2-63bc7d23385c
+
+cmp-ok( # begin: 2f1aad89-ad0f-4bd2-9919-99a8bff0305a
+    extract-row( :string("1 2\n10 20"), :index(2) ),
+    "~~",
+    (10, 20),
+    "extract row where numbers have different widths",
+); # end: 2f1aad89-ad0f-4bd2-9919-99a8bff0305a
+
+cmp-ok( # begin: 68f7f6ba-57e2-4e87-82d0-ad09889b5204
+    extract-row( :string("1 2 3\n4 5 6\n7 8 9\n8 7 6"), :index(4) ),
+    "~~",
+    (8, 7, 6),
+    "can extract row from non-square matrix with no corresponding column",
+); # end: 68f7f6ba-57e2-4e87-82d0-ad09889b5204
+
+cmp-ok( # begin: e8c74391-c93b-4aed-8bfe-f3c9beb89ebb
+    extract-column( :string("1"), :index(1) ),
+    "~~",
+    (1,),
+    "extract column from one number matrix",
+); # end: e8c74391-c93b-4aed-8bfe-f3c9beb89ebb
+
+cmp-ok( # begin: 7136bdbd-b3dc-48c4-a10c-8230976d3727
+    extract-column( :string("1 2 3\n4 5 6\n7 8 9"), :index(3) ),
+    "~~",
+    (3, 6, 9),
+    "can extract column",
+); # end: 7136bdbd-b3dc-48c4-a10c-8230976d3727
+
+cmp-ok( # begin: ad64f8d7-bba6-4182-8adf-0c14de3d0eca
+    extract-column( :string("1 2 3 4\n5 6 7 8\n9 8 7 6"), :index(4) ),
+    "~~",
+    (4, 8, 6),
+    "can extract column from non-square matrix with no corresponding row",
+); # end: ad64f8d7-bba6-4182-8adf-0c14de3d0eca
+
+cmp-ok( # begin: 9eddfa5c-8474-440e-ae0a-f018c2a0dd89
+    extract-column( :string("89 1903 3\n18 3 1\n9 4 800"), :index(2) ),
+    "~~",
+    (1903, 3, 4),
+    "extract column where numbers have different widths",
+); # end: 9eddfa5c-8474-440e-ae0a-f018c2a0dd89
+
+done-testing;